Control method and device of interleaving parallel converter and interleaving parallel converter

Abstract

The invention provides a control method and device of an interleaving parallel converter and the interleaving parallel converter, and belongs to the technical field of power supplies. The control method of the interleaving parallel converter can comprise the following steps: acquiring a current modulation parameter of the interleaving parallel converter; determining a current switching angle based on the current modulation parameter; according to the current switching angle, the interleaving parallel converter is controlled to be switched between the first interleaving mode and the second interleaving mode, so that the output ripple current of the interleaving parallel converter in the target interleaving mode is smaller than or equal to the output ripple current of the interleaving parallel converter in the other interleaving mode at any angle; the target interleaving mode is an operation mode of the interleaving parallel converter at the angle; wherein the first interlacing mode and the second interlacing mode perform interlacing control at different interlacing angles. According to the invention, the output ripple current of the interleaving parallel converter at any angle can be minimum.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a control method and device for interleaved parallel converters and the interleaved parallel converters. Background Art

[0002] The interleaved parallel converter is a power converter structure that achieves higher efficiency by connecting multiple identical converter units in parallel and staggering their switching operations at a certain angle in phase.

[0003] The interleaved parallel converter can have different interleaving modes. In the related art, after the interleaving mode is determined, the interleaved parallel converter is controlled using the same interleaving mode. However, this control method may cause the output ripple current in some intervals to be larger. Summary of the invention

[0004] The embodiments of the present invention provide a control method and device for an interleaved parallel converter and an interleaved parallel converter to solve the problem that the existing control method may cause a large output ripple current in some intervals.

[0005] In a first aspect, an embodiment of the present invention provides a control method for an interleaved parallel converter, comprising:

[0006] Obtaining current modulation parameters of the interleaved parallel converter;

[0007] Based on the current modulation parameters, determining a current switching angle;

[0008] According to the current switching angle, the interleaved parallel converter is controlled to switch between the first interleaved mode and the second interleaved mode, so that at any angle, the output ripple current of the interleaved parallel converter in the target interleaved mode is less than or equal to the output ripple current in the other interleaved mode; the target interleaved mode is the operating mode of the interleaved parallel converter at the angle;

[0009] The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

[0010] In a possible implementation, determining a current switching angle based on a current modulation parameter includes:

[0011] Based on the predetermined correspondence between the modulation parameter and the switching angle, a current switching angle corresponding to the current modulation parameter is determined.

[0012] In a possible implementation, determining a current switching angle based on a current modulation parameter includes:

[0013] The current switching angle is calculated according to a predetermined fitting function and current modulation parameters;

[0014] The fitting function uses the modulation parameter as the independent variable and the switching angle as the dependent variable.

[0015] In a possible implementation, controlling the interleaved parallel converter to switch between the first interleaved mode and the second interleaved mode according to the current switching angle includes:

[0016] Get the current angle;

[0017] If the current angle is within the first preset angle range, the interleaved parallel converter is controlled to operate in the first interleaved mode; the first preset angle range is [kπ-θ, kπ+θ], θ is the current switching angle, and k is an integer;

[0018] If the current angle is not within the first preset angle range, the interleaved parallel converter is controlled to operate in the second interleaved mode.

[0019] In a possible implementation, the modulation parameter includes a modulation ratio or a duty cycle.

[0020] In a possible implementation, the staggered angle of the first staggered pattern is 180 degrees, and the staggered angle of the second staggered pattern is 90 degrees.

[0021] In a second aspect, an embodiment of the present invention provides a control device for an interleaved parallel converter, comprising:

[0022] An acquisition module, used for acquiring current modulation parameters of the interleaved parallel converter;

[0023] A switching angle determination module, used to determine a current switching angle based on current modulation parameters;

[0024] a switching control module, configured to control the interleaved parallel converter to switch between a first interleaved mode and a second interleaved mode according to a current switching angle, so that at any angle, an output ripple current of the interleaved parallel converter in a target interleaved mode is less than or equal to an output ripple current in another interleaved mode; the target interleaved mode is an operating mode of the interleaved parallel converter at the angle;

[0025] The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

[0026] In a third aspect, an embodiment of the present invention provides a control device, comprising a processor and a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to execute the control method of the interleaved parallel converter as described in the first aspect or any possible implementation of the first aspect.

[0027] In a fourth aspect, an embodiment of the present invention provides an interleaved parallel converter, comprising at least two parallel converter units and a control device as described in the third aspect; the converter unit is controlled by the control device.

[0028] In a fifth aspect, an embodiment of the present invention provides a power supply device, comprising the interleaved parallel converter as described in the fourth aspect.

[0029] In a sixth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method of the interleaved parallel converter as described in the first aspect or any possible implementation method of the first aspect are implemented.

[0030] An embodiment of the present invention provides a control method and device for an interleaved parallel converter and an interleaved parallel converter. The method determines a current switching angle based on a current modulation parameter of the interleaved parallel converter, and controls the interleaved parallel converter to switch between a first interleaved mode and a second interleaved mode according to the current switching angle, so that at any angle, the output ripple current of the interleaved parallel converter in a target interleaved mode is less than or equal to the output ripple current in another interleaved mode, thereby minimizing the output ripple current of the interleaved parallel converter at any angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 is a schematic diagram of the structure of an interleaved parallel converter provided by an embodiment of the present invention;

[0033] Figure 2 is a flow chart of an implementation of a control method for interleaved parallel converters provided by an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of output ripple current corresponding to different control methods provided in an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a control device for an interleaved parallel converter provided in an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of a control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0039] The interleaved parallel converter is a power converter structure that achieves higher efficiency by connecting multiple identical converter units in parallel and staggering their switching operations at a certain angle in phase.

[0040] The staggered parallel converter may include at least two converter units in parallel. The converter unit may be a full-bridge structure, a half-bridge structure, a Vienna structure, a three-level structure, a multi-level structure, etc. The converter unit may also be a rectifier circuit, an inverter circuit or a DCDC conversion circuit, etc., which are not limited here. The at least two converter units in parallel generally adopt the same circuit structure, such as both are full-bridge structures or both are half-bridge structures, or they may be different structures, such as part of the full-bridge structure and part of the half-bridge structure, which are not limited here.

[0041] The at least two parallel converter units can be interleaved at a certain interleaving angle. The interleaved parallel converter can have different operating modes, and different interleaving angles can be used for interleaving control in different operating modes. For example, the operating modes of the interleaved parallel converter can include a first interleaving mode and a second interleaving mode, the first interleaving mode is interleaved at 180 degrees, and the second interleaving mode is interleaved at 90 degrees. The interleaving angle can also be called a phase shift angle.

[0042] It should be noted that the above two operating modes are only examples of two possible operating modes, and in practical applications, there may be other operating modes, such as a third interleaving mode, which performs interleaving control at 120 degrees, and so on.

[0043] Figure 1 An example of an interleaved parallel converter is given. Figure 1The interleaved parallel converter includes two parallel converter units 11, and both converter units 11 are of the same full-bridge structure. The interleaved parallel converter may further include a filter module 12 connected to the converter unit 11. The filter module 12 may include a resonant unit connected to the converter unit 11 and a rectifier filter unit connected to the resonant unit, and so on.

[0044] Figure 1 The two converter units 11 can be staggered at 180 degrees or 90 degrees.

[0045] Figure 1 The figure shows a single-phase interleaved parallel converter. If it is a three-phase interleaved parallel converter, it contains three identical Figure 1 The three-phase interleaved parallel converter can be a two-level three-phase inverter or other types of converters, which are not specifically limited here.

[0046] As mentioned above, the interleaved parallel converter can have different interleaved modes. In the related art, after the interleaved mode is determined, the interleaved parallel converter is controlled by the same interleaved mode. For example, if it is determined to be controlled by the first interleaved mode, the interleaved parallel converter is always controlled by the first interleaved mode; if it is determined to be controlled by the second interleaved mode, the interleaved parallel converter is always controlled by the second interleaved mode without switching in the middle. However, in certain intervals of a cycle, the ripple current output by the first interleaved mode is smaller than the ripple current output by the second interleaved mode, and in other intervals of the same cycle, the ripple current output by the second interleaved mode is smaller than the ripple current output by the first interleaved mode. Therefore, the control method in the above-mentioned related art may make the output ripple current of some intervals larger.

[0047] In order to solve the above problems, an embodiment of the present application proposes a control method for interleaved parallel converters.

[0048] See also Figure 2 , which shows an implementation flow chart of the control method of the interleaved parallel converters provided by an embodiment of the present invention, and the execution subject of the control method of the interleaved parallel converters is a control device.

[0049] The method is described in detail below:

[0050] In S201, current modulation parameters of the interleaved parallel converters are obtained.

[0051] The modulation parameters are parameters used to control or describe the characteristics of the modulated signal or the signal to be modulated during the modulation process. The above current modulation parameters refer to the current values ​​of the modulation parameters of the staggered parallel controller.

[0052] In S202, a current switching angle is determined based on the current modulation parameters.

[0053] Different values ​​of the current modulation parameters of the interleaved parallel converter will affect the magnitude of the output ripple current of the interleaved parallel converter in different operating modes, and further affect the current switching angle.

[0054] The current switching angle can be understood as the angle at which the interleaved parallel converter switches in different operating modes according to the magnitude relationship of the output ripple current in the same cycle after being modulated by the current modulation parameters. If there are multiple such angles, the current switching angle is the minimum angle among the multiple angles.

[0055] Exemplarily, it is assumed that in the period of [0, 2π], the output ripple current of the staggered parallel converter after being modulated with the current modulation parameters in the first staggered mode is the first ripple current; it is assumed that in the period of [0, 2π], the output ripple current of the staggered parallel converter after being modulated with the current modulation parameters in the second staggered mode is the second ripple current. If in [0, α], the first ripple current is less than or equal to the second ripple current, in (α, π-α), the first ripple current is greater than the second ripple current, in [π-α, π+α], the first ripple current is less than or equal to the second ripple current, in (π+α, 2π-α), the first ripple current is greater than the second ripple current, and in [2π-α, 2π), the first ripple current is less than or equal to the second ripple current, then the current switching angle is α.

[0056] In S203, according to the current switching angle, the interleaved parallel converter is controlled to switch between the first interleaved mode and the second interleaved mode, so that at any angle, the output ripple current of the interleaved parallel converter in the target interleaved mode is less than or equal to the output ripple current in the other interleaved mode; the target interleaved mode is the operating mode of the interleaved parallel converter at the angle;

[0057] The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

[0058] The target interlacing mode is the first interlacing mode or the second interlacing mode. When the target interlacing mode is the first interlacing mode, the other interlacing mode is the second interlacing mode; when the target interlacing mode is the second interlacing mode, the other interlacing mode is the first interlacing mode.

[0059] In an embodiment of the present application, in the process of controlling the interleaved parallel converter, the control mode can be switched, that is, switching between a first interleaved mode and a second interleaved mode, so that the output ripple current of the interleaved parallel converter at any angle and at any time is the minimum value in the two interleaved modes, so as to achieve the minimum output ripple current of the interleaved parallel converter in the full range, thereby reducing the loss of the switching devices of the interleaved parallel converter and the possibility of malfunction of the interleaved parallel converter due to the ripple current, so as to improve the conversion efficiency of the interleaved parallel converter, and also improve the stability of the operating voltage of the load device, reduce the risk of causing abnormal operation of the load device, and reduce the additional stress on the electronic components in the load device, thereby extending the service life of the equipment.

[0060] Specifically, the interleaved parallel converter may be controlled to switch between the first interleaved mode and the second interleaved mode according to the current switching angle determined above.

[0061] The embodiment of the present application determines the current switching angle based on the current modulation parameters of the interleaved parallel converter, and controls the interleaved parallel converter to switch between the first interleaved mode and the second interleaved mode according to the current switching angle, so that at any angle, the output ripple current of the interleaved parallel converter in the target interleaved mode is less than or equal to the output ripple current in another interleaved mode, thereby minimizing the output ripple current of the interleaved parallel converter at any angle, thereby avoiding affecting the normal operation of the interleaved parallel converter and the load device.

[0062] The above embodiment introduces the main process of the control method of the staggered parallel converter, and each step is further described in detail below. First, S202 is refined, but S202 can have multiple implementation methods, which are described in detail below.

[0063] In one implementation, the above S202 may include:

[0064] Based on the predetermined correspondence between the modulation parameter and the switching angle, a current switching angle corresponding to the current modulation parameter is determined.

[0065] In the embodiment of the present application, the corresponding relationship between the modulation parameter and the switching angle can be obtained by simulation, experiment or calculation, and the corresponding relationship can be the corresponding relationship between different values ​​of the modulation parameter and different values ​​of the switching angle. Based on the corresponding relationship, the switching angle corresponding to the current modulation parameter can be determined, and the switching angle is used as the current switching angle.

[0066] Exemplarily, the correspondence between the listed modulation parameters and the switching angles may be pre-stored in a table. In actual use, the current switching angle corresponding to the current modulation parameters may be obtained by querying the table.

[0067] In some embodiments, the modulation parameters include a modulation ratio or a duty cycle.

[0068] The modulation ratio is the ratio of the modulation wave peak value to the carrier wave peak value. The duty cycle refers to the ratio of the duration of the high level (or on state) to the duration of the entire cycle in a signal cycle.

[0069] Exemplarily, assuming that the modulation parameter is a modulation ratio, an example of the corresponding relationship between the above predetermined modulation parameter and the switching angle is shown in Table 1:

[0070] Table 1 Correspondence between modulation ratio and switching angle

[0071] Modulation ratio 0.5 0.6 0.7 0.8 0.9 Switch Angle 18 21.6 23.76 36 90

[0072] It should be noted that Table 1 only exemplifies the correspondence between several modulation ratio values ​​and switching angle values. In actual applications, Table 1 may contain more correspondence between modulation ratio values ​​and switching angle values. In addition, if a modulation ratio value not shown in Table 1 is encountered, it can be calculated by interpolation method based on the value in Table 1.

[0073] In another implementation, the above S202 may include:

[0074] The current switching angle is calculated according to a predetermined fitting function and current modulation parameters;

[0075] The fitting function uses the modulation parameter as the independent variable and the switching angle as the dependent variable.

[0076] The fitting function also essentially reflects the relationship between the modulation parameters and the switching angle.

[0077] Before the above S202, the following may also be included:

[0078] The corresponding relationships between the multiple groups of modulation parameters and the switching angles are obtained, and the corresponding relationships between the multiple groups of modulation parameters and the switching angles are fitted to obtain the above fitting function.

[0079] In practical applications, after the current modulation parameter is obtained, its value is substituted into the above fitting function to obtain the current switching angle calculated by the above fitting function.

[0080] The above embodiment has introduced S202 in detail, and S203 will be introduced in detail below.

[0081] In some embodiments, in S203, controlling the interleaved parallel converter to switch between the first interleaved mode and the second interleaved mode according to the current switching angle includes:

[0082] Get the current angle;

[0083] If the current angle is within the first preset angle range, the interleaved parallel converter is controlled to operate in the first interleaved mode; the first preset angle range is [kπ-θ, kπ+θ], θ is the current switching angle, and k is an integer;

[0084] If the current angle is not within the first preset angle range, the interleaved parallel converter is controlled to operate in the second interleaved mode.

[0085] The output ripple current of the staggered parallel converter has a certain symmetry and periodicity. Therefore, a first preset angle range can be determined based on the current switching angle. Within the first preset angle range, the output ripple current obtained by the staggered parallel converter working in the first staggered mode is less than or equal to the output ripple current obtained by the staggered parallel converter working in the second staggered mode. Therefore, the embodiment of the present application determines the working mode (operating mode) of the staggered parallel converter based on the current angle and the first preset angle range. When the current angle is within the first preset angle range, the working mode of the staggered parallel converter is determined to be the first staggered mode, and the staggered parallel converter is controlled to work in the first staggered mode; when the current angle is not within the first preset angle range, the working mode of the staggered parallel converter is determined to be the second staggered mode, and the staggered parallel converter is controlled to work in the second staggered mode.

[0086] Among them, k in the above-mentioned first preset angle range can be any integer, k=…,-3,-2,-2-1,0,1,2,3,….

[0087] In some embodiments, the staggered angle of the first staggered pattern is 180 degrees, and the staggered angle of the second staggered pattern is 90 degrees.

[0088] It should be noted that the staggered angles of the first staggered mode and the second staggered mode are only given as an example, and the staggered angles of the two can also be any other achievable angles. In addition, the method provided in the embodiment of the present application can be applicable not only to switching between two staggered modes, but also to switching between three or more staggered modes, so that the output ripple current of the staggered parallel converter is minimized.

[0089] See also Figure 3 , Figure 3 The three waveforms from top to bottom in FIG. 1 are the output ripple current of the interleaved parallel converter controlled by the first interleaved mode, the output ripple current of the interleaved parallel converter controlled by the second interleaved mode, and the output ripple current of the interleaved parallel converter controlled by the interleaved parallel converter provided by the embodiment of the present application. Figure 3It can be seen that the method provided in the embodiment of the present application combines the advantages of the first interleaving mode and the second interleaving mode. When the output ripple current of a mode is smaller, the mode is used for control so that the output ripple current can be minimized in the entire range.

[0090] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0091] Figure 4 The structure diagram of the control device of the staggered parallel converter provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0092] like Figure 4 As shown, the control device 30 of the staggered parallel converter includes: an acquisition module 31 , a switching angle determination module 32 and a switching control module 33 .

[0093] Wherein, the acquisition module 31 is used to obtain the current modulation parameters of the staggered parallel converter;

[0094] A switching angle determination module 32, configured to determine a current switching angle based on current modulation parameters;

[0095] A switching control module 33 is used to control the interleaved parallel converter to switch between the first interleaved mode and the second interleaved mode according to the current switching angle, so that at any angle, the output ripple current of the interleaved parallel converter in the target interleaved mode is less than or equal to the output ripple current in the other interleaved mode; the target interleaved mode is the operating mode of the interleaved parallel converter at this angle;

[0096] The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

[0097] In a possible implementation, the switching angle determination module 32 is specifically configured to:

[0098] Based on the predetermined correspondence between the modulation parameter and the switching angle, a current switching angle corresponding to the current modulation parameter is determined.

[0099] In a possible implementation, the switching angle determination module 32 is specifically configured to:

[0100] The current switching angle is calculated according to a predetermined fitting function and current modulation parameters;

[0101] The fitting function uses the modulation parameter as the independent variable and the switching angle as the dependent variable.

[0102] In a possible implementation, the switching control module 33 is specifically configured to:

[0103] Get the current angle;

[0104] If the current angle is within the first preset angle range, the interleaved parallel converter is controlled to operate in the first interleaved mode; the first preset angle range is [kπ-θ, kπ+θ], θ is the current switching angle, and k is an integer;

[0105] If the current angle is not within the first preset angle range, the interleaved parallel converter is controlled to operate in the second interleaved mode.

[0106] In a possible implementation, the modulation parameter includes a modulation ratio or a duty cycle.

[0107] In a possible implementation, the staggered angle of the first staggered pattern is 180 degrees, and the staggered angle of the second staggered pattern is 90 degrees.

[0108] Figure 5 Schematic diagram of a control device provided by an embodiment of the present invention. Figure 5 As shown, the control device 4 of this embodiment includes: a processor 40 and a memory 41. The memory 41 is used to store a computer program 42, and the processor 40 is used to call and run the computer program 42 stored in the memory 41 to perform the steps in the above-mentioned control method embodiments of each interleaved parallel converter, for example Figure 2 Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-mentioned device embodiments, for example Figure 4 The functions of each module are shown.

[0109] Exemplarily, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 42 in the control device 4. For example, the computer program 42 may be divided into Figure 4 The modules shown.

[0110] The control device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 5It is only an example of the control device 4 and does not constitute a limitation of the control device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the control device may also include input and output devices, network access devices, buses, etc.

[0111] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0112] The memory 41 may be an internal storage unit of the control device 4, such as a hard disk or memory of the control device 4. The memory 41 may also be an external storage device of the control device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the control device 4. The memory 41 is used to store the computer program and other programs and data required by the control device. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0113] Corresponding to the above-mentioned control device, an embodiment of the present application further provides an interleaved parallel converter, comprising at least two parallel converter units and the above-mentioned control device; the converter unit is controlled by the control device.

[0114] Corresponding to the above-mentioned interleaved parallel converter, an embodiment of the present application further provides a power supply device, including the above-mentioned interleaved parallel converter.

[0115] For the relevant description of the staggered parallel converter and the power supply device, reference may be made to the description in the aforementioned embodiments and will not be repeated here.

[0116] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0117] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0118] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0119] In the embodiments provided by the present invention, it should be understood that the disclosed devices / control equipment and methods can be implemented in other ways. For example, the device / control equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0121] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0122] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the control method embodiments of the above-mentioned interleaved parallel converters can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0123] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control method for interleaved parallel converters, characterized in that: include: Obtaining current modulation parameters of the interleaved parallel converter; Based on the current modulation parameter, determining a current switching angle; According to the current switching angle, controlling the interleaved parallel converter to switch between a first interleaved mode and a second interleaved mode, so that at any angle, the output ripple current of the interleaved parallel converter in the target interleaved mode is less than or equal to the output ripple current in the other interleaved mode; The target interleaving mode is the operating mode of the interleaved parallel converter at the angle; The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

2. The control method of the interleaved parallel converter according to claim 1, characterized in that: The determining the current switching angle based on the current modulation parameter includes: Based on a predetermined correspondence between a modulation parameter and a switching angle, a current switching angle corresponding to the current modulation parameter is determined.

3. The control method of the interleaved parallel converter according to claim 1, characterized in that: The determining the current switching angle based on the current modulation parameter includes: Calculating a current switching angle according to a predetermined fitting function and the current modulation parameter; The fitting function uses the modulation parameter as an independent variable and the switching angle as a dependent variable.

4. The control method of the interleaved parallel converter according to claim 1, characterized in that: The step of controlling the interleaved parallel converter to switch between a first interleaved mode and a second interleaved mode according to the current switching angle comprises: Get the current angle; If the current angle is within a first preset angle range, the interleaved parallel converter is controlled to operate in a first interleaved mode; the first preset angle range is [kπ-θ, kπ+θ], θ is the current switching angle, and k is an integer; If the current angle is not within the first preset angle range, the interleaved parallel converter is controlled to operate in a second interleaved mode.

5. The control method of the interleaved parallel converter according to any one of claims 1 to 4, characterized in that: The modulation parameters include a modulation ratio or a duty cycle.

6. The control method of the interleaved parallel converter according to any one of claims 1 to 4, characterized in that: The staggered angle of the first staggered pattern is 180 degrees, and the staggered angle of the second staggered pattern is 90 degrees.

7. A control device for interleaved parallel converters, characterized in that: include: An acquisition module, used for acquiring current modulation parameters of the staggered parallel converter; A switching angle determination module, used to determine a current switching angle based on the current modulation parameters; a switching control module, configured to control the interleaved parallel converter to switch between a first interleaved mode and a second interleaved mode according to the current switching angle, so that at any angle, an output ripple current of the interleaved parallel converter in a target interleaved mode is less than or equal to an output ripple current in another interleaved mode; The target interleaving mode is the operating mode of the interleaved parallel converter at the angle; The first interlacing mode and the second interlacing mode are interlaced at different interlacing angles.

8. A control device, characterized in that: It comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the control method of the interleaved parallel converter according to any one of claims 1 to 6.

9. An interleaved parallel converter, characterized in that: The invention comprises at least two converter units connected in parallel and a control device as claimed in claim 8; the converter units are controlled by the control device.

10. A power supply device, characterized in that: Comprising the interleaved parallel converter as claimed in claim 9.

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